Definitions

1. verb

to become or make something thicker, especially a liquid that has been thinned

“The sauce will rethicken as it cools down.”

2. verb

to make something thicker or more dense, especially in a gradual way

“The glue rethickened over time and became unusable.”

3. noun

the process of becoming or making something thicker, especially a liquid that has been thinned

“The rethickening of the paint caused it to become difficult to work with.”